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Finding the Fourth Proportional to 528.57, 729.77 and 398.16

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Solution

The fourth proportional to 528.57, 729.77 and 398.16 is: 549.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.57 : 729.77 = 398.16 : x
  2. Step 2: Convert to fraction form
    528.57/729.77 = 398.16/x
  3. Step 3: Cross multiply
    528.57x = 729.77 × 398.16
  4. Step 4: Simplify right side
    528.57x = 290,563.23
  5. Step 5: Solve for x
    x = 290,563.23/528.57
  6. Step 6: Final answer
    x = 549.72

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.